Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/fetch/DocumentResourceReference.h

Index: third_party/WebKit/Source/core/fetch/DocumentResourceReference.h
diff --git a/third_party/WebKit/Source/core/fetch/DocumentResourceReference.h b/third_party/WebKit/Source/core/fetch/DocumentResourceReference.h
deleted file mode 100644
index f606fef1fe210aca4b3454bf75d346b28f5e7254..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/fetch/DocumentResourceReference.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Copyright (C) 2012 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1.  Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- * 2.  Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef DocumentResourceReference_h
-#define DocumentResourceReference_h
-
-#include "core/fetch/DocumentResource.h"
-#include "platform/heap/Handle.h"
-
-namespace blink {
-
-class DocumentResourceReference final
-    : public GarbageCollectedFinalized<DocumentResourceReference>,
-      public DocumentResourceClient {
-  USING_GARBAGE_COLLECTED_MIXIN(DocumentResourceReference);
-  USING_PRE_FINALIZER(DocumentResourceReference, removeSelf);
-
- public:
-  explicit DocumentResourceReference(DocumentResource* document)
-      : m_document(document) {
-    ThreadState::current()->registerPreFinalizer(this);
-    m_document->addClient(this);
-  }
-  ~DocumentResourceReference() override {}
-  DocumentResource* document() { return m_document.get(); }
-  DEFINE_INLINE_TRACE() {
-    visitor->trace(m_document);
-    DocumentResourceClient::trace(visitor);
-  }
-
- private:
-  void removeSelf() { m_document->removeClient(this); }
-
-  String debugName() const override { return "DocumentResourceReference"; }
-  Member<DocumentResource> m_document;
-};
-
-}  // namespace blink
-
-#endif